📄 Description (English)
Microsoft Office Remote Code Execution Vulnerability — Microsoft Office contains an unspecified vulnerability that allows for remote code execution.
🤖 AI Executive Summary
CVE-2021-27059 is a critical remote code execution vulnerability in Microsoft Office with a CVSS score of 9.0, allowing attackers to execute arbitrary code through malicious Office documents. With public exploits available, this poses an immediate threat to Saudi organizations heavily reliant on Office productivity suites. Immediate patching is essential to prevent widespread compromise across government, banking, and corporate sectors.
📄 Description (Arabic)
🤖 AI Intelligence Analysis Analyzed: Apr 20, 2026 08:49
🇸🇦 Saudi Arabia Impact Assessment
This vulnerability poses severe risk to Saudi banking sector (SAMA-regulated institutions), government agencies (NCA oversight), healthcare providers, energy sector (ARAMCO and subsidiaries), and telecommunications companies (STC, Mobily). The widespread use of Microsoft Office across all sectors makes this a critical infrastructure concern. Threat actors can distribute malicious documents via email to compromise endpoints, establish persistence, and exfiltrate sensitive data including financial records, government communications, and critical infrastructure information.
🏢 Affected Saudi Sectors
Banking and Financial Services
Government and Public Administration
Healthcare and Medical Services
Energy and Utilities
Telecommunications
Education
Manufacturing
Retail and E-commerce
🎯 MITRE ATT&CK Techniques
T1566.001 - Phishing: Spearphishing Attachment
T1203 - Exploitation for Client Execution
T1559.002 - Inter-Process Communication: Dynamic Data Exchange
T1106 - Native API
T1053.005 - Scheduled Task/Job: Scheduled Task
T1547.001 - Boot or Logon Autostart Execution: Registry Run Keys
T1005 - Data from Local System
T1041 - Exfiltration Over C2 Channel
⚖️ Saudi Risk Score (AI)
9.2
/ 10.0
🔧 Remediation Steps (English)
IMMEDIATE ACTIONS:
1. Identify all Microsoft Office installations across your organization using asset management tools
2. Disable Office macro execution in Group Policy (User Configuration > Administrative Templates > Microsoft Office > Security Settings)
3. Block suspicious Office file extensions (.docm, .xlsm, .pptm) at email gateways
4. Implement application whitelisting to restrict Office processes
PATCHING GUIDANCE:
1. Apply Microsoft security updates immediately through Windows Update or WSUS
2. Prioritize patching for systems handling sensitive data (finance, government, healthcare)
3. Test patches in non-production environment before enterprise deployment
4. Verify patch installation using Microsoft Update Catalog verification
COMPENSATING CONTROLS:
1. Deploy endpoint detection and response (EDR) solutions to monitor Office process behavior
2. Implement network segmentation to isolate critical systems
3. Enable attack surface reduction rules in Windows Defender
4. Monitor for suspicious Office child processes (cmd.exe, powershell.exe, wscript.exe)
DETECTION RULES:
1. Alert on Office applications spawning cmd.exe, powershell.exe, or wscript.exe
2. Monitor for Office processes accessing unusual registry keys or file system locations
3. Track Office document downloads from external sources
4. Log all macro execution attempts and block unsigned macros
🔧 خطوات المعالجة (العربية)
الإجراءات الفورية:
1. تحديد جميع تثبيتات Microsoft Office عبر المنظمة باستخدام أدوات إدارة الأصول
2. تعطيل تنفيذ وحدات الماكرو في Office من خلال Group Policy
3. حظر امتدادات ملفات Office المريبة على بوابات البريد الإلكتروني
4. تطبيق القوائم البيضاء لتقييد عمليات Office
إرشادات التصحيح:
1. تطبيق تحديثات أمان Microsoft فوراً عبر Windows Update
2. إعطاء الأولوية لتصحيح الأنظمة التي تتعامل مع البيانات الحساسة
3. اختبار التصحيحات في بيئة غير الإنتاج قبل النشر
4. التحقق من تثبيت التصحيح باستخدام Microsoft Update Catalog
الضوابط البديلة:
1. نشر حلول كشف ومعالجة نقاط النهاية (EDR)
2. تطبيق تقسيم الشبكة لعزل الأنظمة الحرجة
3. تفعيل قواعد تقليل سطح الهجوم في Windows Defender
4. مراقبة عمليات Office المريبة
قواعد الكشف:
1. تنبيهات عند قيام تطبيقات Office بتشغيل cmd.exe أو powershell.exe
2. مراقبة وصول Office إلى مفاتيح التسجيل غير المعتادة
3. تتبع تنزيلات مستندات Office من مصادر خارجية
4. تسجيل جميع محاولات تنفيذ الماكرو وحظر الماكرو غير الموقعة
📋 Regulatory Compliance Mapping
🟢 NCA ECC 2024
A.5.1.1 - Information security policies and procedures
A.8.1.1 - User endpoint devices protection
A.8.2.1 - Malware protection
A.8.3.1 - Management of removable media
A.12.2.1 - Restrictions on software installation
A.12.6.1 - Management of technical vulnerabilities
🔵 SAMA CSF
ID.RA-1 - Asset management and vulnerability identification
PR.IP-12 - Software, firmware, and information integrity mechanisms
PR.PT-3 - Access control and least privilege implementation
DE.CM-8 - Vulnerability scans and assessments
RS.MI-2 - Incident containment and eradication
🟡 ISO 27001:2022
A.12.2.1 - Restrictions on software installation
A.12.6.1 - Management of technical vulnerabilities
A.14.2.1 - Secure development policy
A.8.1.1 - User endpoint devices
A.5.1.1 - Information security policies
🟣 PCI DSS v4.0
6.2 - Security patches and updates
6.5.1 - Injection flaws prevention
11.2 - Vulnerability scanning
🔗 References & Sources 0
No references.
📦 Affected Products / CPE 1 entries
Microsoft:Office